Cutting head for dry shavers



Nov. 4, 1952 c. J. J. DANKERS 2,616,168

CUTTING HEAD FOR DRY SHAVERS Filed May 3, 1946 INVENTOR. amvmczwzwmmiwmw Patented Nov. 4, 1952 christiaan. lacu us phus, ankers, Bin

hoven, Netherlands, assigglor, by mesne assign- 'ments,- to Hartford National'Ba-nk'and'Trust Company; Hartford, Conn., as trustee Appli t onrMay 19 6, SeriaLNa, 667,5 "In, he Ne he l March; 18. 1 4

Section" 1, Public Law 690, August 8, 1946 Patentexpires March 18;..1-963 4 Claims.-

This invention-relates; ea-1 cutt g heel-dict;

dry-shaver, Itischaracte zedaby hat theart he cutt ngill ate which, is: to be; laid-against the skin comprises two org more-cqncentricpaths, each of which is provided with :apentures'and comprises a. separate, annular unning surface for a cutting member-, said concentric; paths being; relatively, separated by; one ormore circular grooves, while a. central; depression: is provided inside, the inner annular pathand, the apertures the; paths, extend into; the, supportingsider walls of said depression.

A cutting: plate is: already. known, in the art which, comprises apath provided with, slits, and an annularrumiing. urface, at, the. inside of which. a. cen ral; d pr ss on, sp ov ded, h s its er shaving is obtained, since the-ho'ssibilitiesof' the hairs being. caught arecon-siderably greater. When, use. s, made of,,f10.r. example, twov concentric paths, the possibilities of catching hairs will enerally bev doubled. since with. a single, stroke of. the. cutt ng. plat across the. skin. here, s pas ed; n addition. in two diam tltally ppo te po nts. he. dep i n. w ich is. c nc ntri a ly 9..- cat'ed' tw n. the. paths and thc'h rsw ichiarc erected inside th depression-as. a. resul of, the

bu i g. f; the. skin are supplied in, the said points undergf avorable conditions to; the endsqf the,v slits provided; in the side-walls of; the depression (respectively'in the'out'er wall of the inner path andthe inner wall ofthe outer path).

Relatively to the above mentioned' known cutting plate of equal, diameter, the fact that the active shaving surface is reduced by the surface required for the circular depression does not constitut'eany essential drawback which would neutralise the advantage obtained by the'increased hair catching possibility, since with a cutting plate ofthe known kind: it is customary to utilise a'quick-rctating cutting member. The width of theannular running surface covered by the cutting memberwhich is either rotating or vibrating about; a shattzin acircular path isctmoreor less; minor importance in. View of; the; high; speed the cutting member'- thiscasethe need-pass through. a but. mal len th O slittobe cut off".

Another, adv nta ed.- heaq ttin pla e according; to- 17113::fill/en1510 111 CQn'fiiStS in thatthe circular d n ess on; be we n he co se t-dc paths m y seizve. n. addi c11,.\ str h n oove, wh e. aea nzas. com a ed: w th: he s id known cutting-s ate iamet r, e n hs for the cutting member owing to their smaller width resultin-gyfrom: th circular; depression are less i ble to defiecti m.

It) s me io ed; hewcv n. hat: is: course notcces a v or: cutt n p-lfl nacco-rding to the invention to be of the same: diameter as the saidvknown cutting plate and that it may be larger-in diameter; in particular when use is made Qf more than. t osco e ic-pa h The .apentures; in the paths; are preferably con- .tinuous slits, the two; extremitiesof which extend intovthe supporting side-walls. As far as the SHBJQB! available; permits, these extremitie may altein 'ti. .-ely. be widenedto befunnel-shaped; so that .the introduction of, the; hairs is faci1itated.

.Eurther, corresponding slits: in the paths are preferably; provided, in alignment with each other,, due to. which alignment. the slits may be D vided; in, asimple. manner in" one operationwiththe :aid of a. free, milling cutter.

The; circular; depression-s; betweentheconcentrip paths; may beinterrupted inseveral suitable points, in, such manner. that these: points serve asrigid connecting: bridges between the concentric paths, more particgularly when the cutting plate; is punched and; pressed from thin material.

sincethis method may; however, involve a loss Off active; shaving; surface (les catching possibilitieslit is; advisable that the circular depression should constitute a continuous groove. In accordanceiwith the shape chosen, the material and the, thickness of materialdtmay be necessary, in order tmavoid troublesome deflection, that the bottom'and theside-walls of the groove-shaped depression are so strengthened; as to constitute aeli id: construction, which highly. contributes to the rigidness of the whole.

he inventionwill be explained more fully by referenceto, the accompanying-i drawing showing, by" way: Qf. example, :a few embodiments hereof:-

Eigs. 1 showsla, top plan view of a cutting plate having-shprtenedslits accordingto my invention.

Eigl-c, shows, a cross-sectional; view of the cut ihe lateq. Elie-.11 akehsa i ne-theiine 1a-1:a..

F st? hcws etch clan of; a cutti g p ate i h rad ally steadihs. ohe sa cor ine o. y inv tion,

Fig,-

show a. cnoss=sectional view of the 3 cutting plate of Fig. 2 taken along the line 2a-2a.

Fig. 3 shows a top plan view of a cutting plate with diagonally extending slits according to my invention.

Fig. 3-a shows a cross-sectional view of the cutting plate of Fig. 3 taken along the line 3a--3a.

Fig. 4 shows a top plan view of the cutting member used with the cutting plates of Figs. 1, 2 and 3.

Fig. 4-11 is a cross-sectional view of the cutting member of Fig. 4 taken along the line 4a4a.

Fig. 5 shows a top plan view of a modification of the cutting member of Fig. 4.

Fig. 5-a is a cross-sectional View of the cutting member of Fig. 5 taken along the line 5a-5a.

Fig. 6 is a top plan View of another modification of the cutting member of Fig. 4.

Fig. 1 shows the cutting plate I of a dry-shaver of which the portion which is to be laid against the skin comprises two concentric paths 2 and 3, each of which is provided with apertures 4 and comprises a running surface 5 and 6 respectively.

The paths 2 and 3 are relatively separated by a circular depression 1, while a central depression 8 is provided inside the inner part 3. The apertures 4 in the paths 2 and 3 extend into the supporting side-walls 9, l and II, I2 respectively. In this example the central depression 8 comprises a bottom l3.

The slits provided in the paths 2 and 3 of Fig. 2 are preferably continuous slitsextending from the interior to the exterior, as is indicated by M, due to which the active shaving surface is increased. The slits l provided in the paths 2 and 3 of Fig. 3 are preferably continuous slits diagonally extending from the interior to the exterior of the plate. These slits are provided in both paths in alignment with each other and may consequently be cut in a single operation, for example with the aid of a free milling cutter.

In order to give the cutting plate according to the invention a sufiiciently rigid construction, it may be desirable to connect the two paths by means of strengthening ribs or the like. To this end, the annular depression 1 may be interrupted in several points, in Fig. 3 for example at [6. When use is made of a punched cutting plate, it

may for example be interrupted at 16. If desired,

there may be provided at this place another strengthening rib, shown in the Figure 3 and indicated by H, which protrudes from the flat portion of the cutting plate which is to be laid against the skin.

However, by making the portion of the depression 1 of a rigid construction, for example by means of sufiiciently thick walls and a sufliciently thick bottom at l8, strengthening connections between the paths 2 and 3 are rendered superfluous, so that the depression 1 may be without interruption, which contributes to the shaving capacity. Slits which are widened at their extremities are designated by I9 of Fig. 2.

A suitable cutting member belonging to the cutting plate according to the invention is indicated by in Fig. 4. It comprises a certain number of cutting arms 22 and 23 respectively which project from a plane portion 2| as shown by Fig. 4-a and are located in several concentric paths which are relatively separated. The cooperation between such a cutting member and the cutting plate according to the invention will be clear without further explanation. By means of two apertures 24 it may be driven by a shaft with lugs or in any other known manner.

Since it is in general difiicult to cause the two running surfaces 5 and 6 for the cutting member of Figs. 1, 2 and 3 to be located exactly in the same plane and, in addition, these running surfaces may be chosen in fundamentally different planes, a cutting member as shown in Figs. 5, EH: and 6 is preferable.

In Fig. 5 use is made of a star 25 of resilient material which has secured a little chisel 26 to the extremity of each of its arms. It is thus possible to obtain an accurate engagement of each chisel with the running surface.

In Fig. 6 all the cutting arms 21 and 28 respectively, which are located in concentric paths, are united into separate parts 29 and 30 respectively, each of which mechanically constitutes one unit. The two parts are driven from the central portion by means of two lugs and two recesses 3!, the relative possibility of movement between the two parts being such that each can adjust itself on the associated'running surface.

What I claim is:

1. Dry shaving apparatus, comprising an annular cup-shaped cutting plate and an enclosed resilient cutting member, said cutting plate being provided with a central recess and with at least two substantially flat concentric annular shaped running surfaces for the said cutting member and comprising at least one ring-shaped recessed portion extending between the running surfaces thereof, side walls connecting said annular running surfaces to said central recessed portion and to said ring-shaped recessed portion between the running surfaces, said apertures extending into said side walls, said ring-shaped portion being integral with said cutting plate and extending below the shaving surfaces of the cutting plate, and said cutting member having at least two sets of concentric cutting elements respectively contacting said two concentric running surfaces.

2. Dry shaving apparatus, comprising an annular cup-shaped cutting plate and a cutting member, said cutting plate being provided with a central recessed portion and with at least two substantially flat concentric annular shaped running surfaces for the said cutting member and comprising a plurality of arc-shaped recessed portions extending between the running surfaces of said cutting plate, side walls connecting said annular running surfaces to said central recessed portion and to said arc-shaped recessed portions between the running surfaces, said running surfaces having a plurality of apertures therein, said apertures extending into said side walls, said areshaped portions being integral with said cutting plate and extending below the shaving surfaces of the cutting plate, and said cutting member having at least two sets of concentric cutting elements respectively contacting said two concentric running surfaces.

3. Dry shaving apparatus, comprising an annular cup-shaped cutting plate and two concentric annular shaped cutting members, said cutting plate being provided with a central recessed portion and with at least two substantially fiat annular concentric running surfaces for the said members and comprising a recessed ring-shaped portion extending between the shaving surfaces thereof, side walls connecting said annular running surface to said central recessed portion and to said ring-shaped recessed portion between the running surfaces, said running surfaces having a plurality of apertures therein, said apertures extending into said side wall, said ring-shaped portion being integral with said cutting plate and extending below th shaving surfaces of the cutting plate, each of said cutting members being provided with cutting arms for one of said surfaces, the outer of said members being driven by the inner member.

4. Dry shaving apparatus, comprising an annular cup-shaped cutting plate and an enclosed cutting member, said cutting plate being provided with a central recessed portion and having at least two substantially fiat concentric annular shaped running surfaces for the said cutting member, said cutting plate further comprising a plurality of curved portions, said curved portions being integral with said cutting plate and extending between and below the running surfaces of the cutting plate, side walls connecting said annular running surfaces to said central recessed portion and to said curved portions, said running surfaces having a plurality of apertures therein, said apertures extending into said side walls, the side of the said cutting plate to be placed against the skin also being provided with a plurality of ridge portions radially extending from the said central recessed portion and being integral with said cutting plate.

CHRIS'I'IAAN JACOBUS JOSEPHUS DANKERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

